High-Isolation Diplexer With High Frequency Selectivity Using Substrate Integrate Waveguide Dual-Mode Resonator

Kaijun Song,Shema Richard Patience,Yong Fan,Abdiqani Mohamed Iman,Yedi Zhou,Yuxuan Chen

doi:10.1109/access.2019.2926121

Kaijun Song, Shema Richard Patience + Show 4 more

Open Access

https://doi.org/10.1109/access.2019.2926121

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Abstract

Two novel substrate integrated waveguide (SIW) high-isolation dual-mode diplexers based on electromagnetic perturbation technology have been presented in this paper. The capacitive perturbation and inductive perturbation have been introduced in the presented dual-mode diplexers. Furthermore, this perturbation can produce two transmission zeros in the real frequency axis, and those transmission zeros in the real frequency axis can improve the frequency selectivity of each channel of the diplexer and the isolation between two channels. Two different SIW dual-mode diplexers have been designed, fabricated, and measured. The measured insertion losses at each center frequency are 2.2 and 2.4 dB for the diplexer 1, 1.8, and 1.5 dB for the diplexer 2, with the fractional bandwidths of 1.95% and 2.08% for the diplexer 1 and 1.94% and 2.05% for the diplexer 2. The isolation is greater than 45 dB. Reasonable agreement between the simulated and measured results is achieved for the proposed dual-mode SIW diplexers.

Highlights

The Diplexer is an important component of the electronic systems with single input and two completely different output frequency ports
It is important for the filter design to generate the transmission zero in real frequency axis, which can improve the frequency selectivity of the passband
M12 is the coupling between resonator 1 and resonator 2, while MSL is the coupling between source and load. It can be seen from the above analysis that the two transmission zeros in real frequency axis can be obtained by using capacitive perturbation, which can improve the frequency selectivity of the passband

Summary

INTRODUCTION

The Diplexer is an important component of the electronic systems with single input and two completely different output frequency ports. K. Song et al.: High-Isolation Diplexer With High Frequency Selectivity Using SIW Dual-Mode Resonator different layers which connected and coupled through vertical holes in multilayer diplexer. The high-isolation diplexers have been designed by using the dual-mode SIW resonator. One diplexer includes two different channel filters (namely the low-bandpass filter and the high-passband filter), each channel filter is realized by using the dual-mode SIW resonator, which is mainly decided by the resonator size. The passband has a transmission zero on the each side It means the good frequency selectivity can be obtained for the SIW dual-mode bandpass filter. K. Song et al.: High-Isolation Diplexer With High Frequency Selectivity Using SIW Dual-Mode Resonator TABLE 1. The proposed T-junction structure still keeps the ability of divide electromagnetic field into two

AND DISCUSSION

CONCLUSION